asp.net上传图片(简单)

FileUpload：

protected void UploadButton_Click(object sender, EventArgs e)

    {

        long id = Request.QueryString["id"] == null ? -1 : Convert.ToInt64(Request.QueryString["id"]);

        string pname = id.ToString();

        //查找前台中创建的FileUpload1对象并获取路径

        FileUpload file=null ;

        for (int i = 0; i < DataList1.Items.Count; i++)

        {

             file = (FileUpload)DataList1.Items[i].FindControl("FileUpload1");

        }

        string uploadName = file.PostedFile.FileName.ToString(); //获取待上传图片的完整路径，包括文件名 



        string pictureName = "";//上传后的图片名，以当前表的主键为文件名，确保文件名没有重复 



        if (uploadName != "")

        {

            int idx = uploadName.LastIndexOf(".");

            string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 

            suffix = suffix.ToLower();



            if (suffix == ".jpg" || suffix == ".gif" ||  suffix == ".bmp" || suffix == ".png")  

            {

                pictureName = pname + suffix;



// 注：也可以当前时间为文件名

// pictureName = DateTime.Now.Ticks.ToString() + suffix; 

            }

            else 

            {

                Response.Write("<script>alert('图片格式不正确!')</script>");

                Response.End(); 

            }

        }

        try

        {

            if (uploadName != "")

            {

                string path = Server.MapPath("~/Photo/");

                file.PostedFile.SaveAs(path + pictureName);

                Response.Write("<script>alert('图片上传成功!')</script>");

            }

        }

        catch (Exception ex)

        {

            Response.Write(ex);

        } 

    }